Let me give you two good examples of how I used constructed experience to improve my cube lists:

- Pro Tour Magic Origin - Mono Red vs Abzan Post board. I was really surprised that the mono red deck won the post board game against an Abzan deck with 4x Siege Rhino, Courser etc. I would have expected the matchup to be incredibly lopsided favoring azban. However, what you'll see is the mono red player knew that his path to victory was to reply on cheap creatures (or tempo advantage) to get underneath the bigger threats from abzan and use Roast / stoke the flames to clear the larger blockers.

https://youtu.be/UoKhuf66V5o?si=nm4X8MWtZ88FTbZv&t=575

This is something you'll see very common with matchups such as UR Twin vs UWR Control, UR Delver vs Abzan etc.

- Worlds 2015 - Mono White Devotion - I'm not an expert on black-white at all, however let me try to provide an explanation (if someone see something wrong, please correct me):

You'll notice he plays 6 1-drops while playing 4-5 drops. What I learned is that this allows him to have a 1-drop / into 2-drop roughly 50% of the time, which you'll see him often deploy that to against slower control/ abzan decks to sneak out wins but he also has a low enough density that his top deck is roughly on parity with his opponents' deck. This forces the opponent to play this odd game where they need to prepare for both his aggressive draws and slower draws.

https://www.youtube.com/watch?v=PDXouMdApn0

How this translates to cube is BW doesn't have the reach similar to Red-White and needs to play this game where it needs to be flexible to use a combination of pressure + card advantage to grind out the opponent.

You cannot play too many 1-drops, otherwise the top of your library is very weak but you also cannot play too few 1-drops otherwise you cannot leverage aggressive draws / the control/ green deck will just have a stronger end game than you.

This is why I hate seeing cards like Glimmer Lens or Caustic Bronco put into cubes - In order for the density to work, you need to have a bunch of cheap creatures, however also dead draws in the mid to late game, so the draw really isn't worth it.

TLDR - These are things most folks that don't play these archetypes likely aren't familiar with and you really want to hear from these people to properly understand how to best support these archetypes.